THERMAL CONDUCTIVITY OF GLASS WOOL FIBER（热导率的玻璃羊毛纤维）.pdf

THERMAL CONDUCTIVITY OF GLASS WOOL FIBER Oldřich Zmeškal1 1 2 , Martin Nežádal and Ľubomír Lapčík 1Institute of Physical and Applied Chemistry, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic 2Institute of Physics and Material Engineering, Faculty of Technology, University of Thomas Bata, Zlín email: zmeskal@fch.vutbr.cz Abstract The article is dealing with study of thermal properties of fiber materials. For specific heat, thermal diffusivity and thermal conductivity determination the transient pulse method was used [1]. The results were correlated with the size of heating body and with the thickness of measured material. With the usage of electrical model the dissipations of thermal system were detected. Key words: glass wool fiber, fractal structure, specific heat, thermal diffusivity, thermal conductivity and transient pulse method 1. Introduction The fiber materials (e.g. glass wool fiber) are often used as thermal isolation in air and building industry. Therefore it is important to develop simply methods that will enable to determine its thermal properties (specific heat, thermal diffusivity and thermal conductivity) with suitable precision. The most often are these values measured in the stable state [1]. In this case it is necessary to provide defined thermal conditions (method of protected thermal table, method of indicator of thermal flow). The other methods are based on determination of thermal parameters from stepwise or pulse responses [2, 3]. The methods based on evaluation of responses to the periodical (harmonic